- The dumpster is clearly labeled as "No Trespassing" or "Private Property".
- The dumpster is located on private property and you do not have the permission of the owner to be there.
- You take anything that has been secured with a lock or other fastening device.
- You take anything marked "medical waste."
- You are a registered sex offender.
In this case, dumpster diving in Dallas, Texas, would be considered illegal.